Fix the following warning:

* `DEPRECATED: DI is instantiating a token "" that inherits its @Injectable decorator but does not provide one itself.`
`This will become an error in a future version of Angular. Please add @Injectable() to the "" class.`

* This was started on in [https://github.com/opf/openproject/pull/20919/commits/d8b8479ee6b66e8a587812c81d6df7d90bfa95d4](https://github.com/opf/openproject/pull/20919/commits/d8b8479ee6b66e8a587812c81d6df7d90bfa95d4) but broke CI


<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/804550/content">

Although these are just warnings, they might be masking other issues.

Begin of the insertion### Notes for QA

End of the insertion Begin of the deletion Note to QA:End of the deletion this can be closed once reviewed/merged by a dev.